3ds: 3ds port sources. Second set of two.

This commit adds new files written exclusively for the 3ds port.

Additional comments:

1. Plugins works, but will be enabled in future commits.
2. The port has only been tested on the New 3DS.
3. Not all features of rockbox have been tested so there may be bugs or non-functional features.
4. There is a known issue where a random crash can occur when exiting the app.

Change-Id: I122d0bea9aa604e04fca45ba8287cf79e6110769

firmware/export/config/ctru.h

@@ -0,0 +1,102 @@
+/*
+ * This config file is for the N3DS hosted application
+ */
+
+/* We don't run on hardware directly */
+#define CONFIG_PLATFORM (PLATFORM_HOSTED|PLATFORM_CTRU)
+#define HAVE_FPU
+
+/* For Rolo and boot loader */
+#define MODEL_NUMBER  100s
+#define MODEL_NAME    "CTRU"
+
+#define USB_NONE
+
+#define CONFIG_CPU    N10480H
+
+#define CPU_FREQ      268000000
+
+/* Define this if you have adjustable CPU frequency */
+/* #define HAVE_ADJUSTABLE_CPU_FREQ */
+
+/* define this if you have a colour LCD */
+#define HAVE_LCD_COLOR
+
+/* define this if you want album art for this target */
+#define HAVE_ALBUMART
+
+/* define this to enable bitmap scaling */
+#define HAVE_BMP_SCALING
+
+/* define this to enable JPEG decoding */
+#define HAVE_JPEG
+
+/* define this if you have access to the quickscreen */
+#define HAVE_QUICKSCREEN
+
+/* define this if you would like tagcache to build on this target */
+#define HAVE_TAGCACHE
+
+/* LCD dimensions */
+#define LCD_WIDTH  320
+#define LCD_HEIGHT 240
+
+#define LCD_DEPTH  16
+#define LCD_PIXELFORMAT RGB565
+
+#define LCD_OPTIMIZED_UPDATE
+#define LCD_OPTIMIZED_UPDATE_RECT
+#define LCD_OPTIMIZED_BLIT_YUV
+
+/* define this to indicate your device's keypad */
+#define HAVE_TOUCHSCREEN
+#define HAVE_BUTTON_DATA
+
+/* define this if you have a real-time clock */
+#define CONFIG_RTC APPLICATION
+
+/* Power management */
+#define CONFIG_BATTERY_MEASURE PERCENTAGE_MEASURE
+#define CONFIG_CHARGING        CHARGING_MONITOR
+#define HAVE_SW_POWEROFF
+
+/* The number of bytes reserved for loadable codecs */
+#define CODEC_SIZE 0x100000
+
+/* The number of bytes reserved for loadable plugins */
+#define PLUGIN_BUFFER_SIZE 0x80000
+
+#define AB_REPEAT_ENABLE
+
+
+/* #define HAVE_SCROLLWHEEL */
+#define CONFIG_KEYPAD CTRU_PAD
+
+#define HAVE_CTRU_AUDIO
+#define HAVE_HEADPHONE_DETECTION
+/* #define HAVE_SW_VOLUME_CONTROL */
+/* #define PCM_SW_VOLUME_UNBUFFERED */
+/* #define PCM_SW_VOLUME_FRACBITS  (16) */
+
+/* Define this for LCD backlight available */
+#define HAVE_BACKLIGHT
+#define HAVE_BACKLIGHT_BRIGHTNESS
+
+/* Main LCD backlight brightness range and defaults */
+#define MIN_BRIGHTNESS_SETTING      16
+#define MAX_BRIGHTNESS_SETTING      142
+#define BRIGHTNESS_STEP             5
+#define DEFAULT_BRIGHTNESS_SETTING  28
+#define CONFIG_BACKLIGHT_FADING     BACKLIGHT_FADING_SW_SETTING
+
+#define CONFIG_LCD LCD_COWOND2
+
+/* Define this if a programmable hotkey is mapped */
+#define HAVE_HOTKEY
+
+#define BOOTDIR "/"
+
+/* No special storage */
+#define CONFIG_STORAGE STORAGE_HOSTFS
+#define HAVE_STORAGE_FLUSH
+